What is the sum of the arithmetic series below? use the formula for the sum of an arithmetic series. 18 ∑ 2i-9 i=1

The first term is 2(1) - 9 = -7
the common difference is 2
there are (18 - 1) + 1 = 18 terms in this series
the 18th term is -7 + 2(18-1) = 27

the sum is

sn = 18/2(-7 + 27) = 180

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